Pipe marking device



March 22, 1949. I D, ST M 2,464,901

PIPE MARKING DEVICE Filed Marqh 14, 1944 Patented Mar. 22, 1949 UNITED STATES PATENT OFFICE PIPE MARKING DEVICE Lewis D. Sturm, Portland, Oreg.

Application March 14, 1944, Serial No. 526,441

1 Claim. 1

This invention relates generally to ellipsographs and particularly to an ellipsograph especially adapted for marking ellipses or circles on angling or curved or irregular surfaces.

The main object of this invention is to provide an exceedingly simple and eflicient instrument whereby ellipses may be easily and accurately scribed upon inclined, irregular or curved surfaces in order to maintain a correct relationship to a. predetermined axis.

The second object is to make an ellipsograph whereby circular openings may be made in the deck and side of a vessel for the reception of a hawse pipe.

The third object is to provide a device of the class described whereby the process of layin out an opening in a round pipe for the reception of another round pipe, whether normal to or inclined with the axis of the first pipe, will be greatly facilitated.

The fourth object is to produce an ellipsogra-ph of the class described which will lay out ellipses in corners or angles as easily as it will on a flat surface.

A further object is to produce an ellipsograph which can be used for indicating clearances over long spans.

I accomplish these and other objects in the manner set forth in the following specification as illustrated in the accompanying drawing, in which:

Fig. 1 is a side elevation of the device.

Fig. 2 is an end elevation.

Fig. 3 is a plan of the device.

Fig. 4 is an end elevation of the device as applied to a circular pipe.

Fig. 5 is a side elevation of Fig. 4.

Fig. 6 is a fragmentary enlarged section taken along the line 6-6 in Fig. 5.

Fig. 7 is a fragmentary section through a portion of a ship's deck and side showing the manner of laying out a hawse pipe opening.

Fig. 8 is a section through some overhead joists and a pair of supports showing the use of elongated wire for a long span axis.

Similar numerals refer to similar parts throughout the several views.

Referring in detail to the drawing, there is shown in Figs. 1 to 3 a guide rod l0 which must be held along the axis of the circle or ellipse or of the pipe which is to be passed through the elliptical opening being formed.

On the guide rod I0 is mounted a slide H, whose laterally turned ears I! are provided with openings I 3 to slidably receive the rod l0. Se-

" cured to the back of the slide n is a pencil supporting'arm l4 whose pencil l5 may be held thereon in any convenient manner. The arm I 4 is preferably provided with additional holes l6 for varying the radius thereof. A bolt I1 is used to clamp the. arm I4 in a desired relationship to the slide II.

The operation of this simple form of the device is best shown in Fig. 7, wherein is illustrated the deck l8 and the side 19 of a vessel through which it is desired to install a hawse pipe not shown. In this case it is only necessary to drill a hole 20 in the deck 18 and a second hole 2| in the side I9, both in axial alignment to receive the guide rod I 0. The slide II is then placed on the end 22 to mark the elliptical opening on the side I9 or on the end 23 to mark the elliptical opening on the deck Hi.

In this case, the operator need only revolve the arm l4 on the guide l0, holding the point of the pencil l5 against the work resulting in the formation of a true ellipse which will perfectly receive a cylindrical object having a radius equal to the distance of the point of the pencil l5 to the axis of the rod III.

In the form of the device shown in Figs. 4, 5 and 6, there is shown a pipe 24 in which it is desired to form an opening to receive a second pipe whose axis is inclined somewhat from the axis of the pipe 24. To perform this class of work there is provided a channel shaped base 25 whose lowermost edges 26 are provided with upturned ears 2! to which are attached the bent arms 28 between whose upper ends 29 are pivotly mounted the clamping jaws 30, adapted to receive the rod Ill. The jaws 30 may be clamped upon the rod ill by tightening the nut 3| on the bolt 32. It will be noted that this tightening action not only clamps the jaws 30 on the rod l0 but also maintains angular relationship between the rod l0 and the arms 28, whose lower ends are pivotly connected to the ears 2! by means of the I bolts 32.

The lower end 33 of the rod I0 is provided with a point 34 of reduced diameter which projects through a hole formed at the center of the opening to be scribed.

It follows that if the point 34 is inserted into the opening and the angle between the members Ill and 28 is fixed, then the base 25 is fixed and all that the operator need to do is to move the arm I4 around the rod I 0 with the pencil l5 resting upon the pipe 24, thereby scribing the line 35 conforming to the outside of the pipe to be connected to the pipe 24.

In Fig. 8 is shown the use of my device for insuring the proper clearance for a round pipe when said pipe is to be placed close to rafters 36. In this case, suitable supports 31 are provided and a strong wire 38 is stretched between the supports 3! by means of the eye bolt 39 and the wire 38 is used as a guide for the slide ll, making it possible to use the arm M to scribe the necessary clearance on the rafters 36 by means of'the pencil I51 While several representative applications of my device have been illustrated, it must be understood that the field of use is practically unlimited,

and that while the device itself need not be al-- tered, various means may be found convenient for supporting the guide along the imaginary axis'of' the pipe or conduit to be installed. For'example,

in place of employing a pencilpoint to mark a circle or ellipse on a steel plate, a cuttingtorch' may be substituted and the cutting done directly instead of resorting to a preliminary marking operation.

While I have thus illustrated and described myof said saddle at one end thereof in spaced relation to each other at their lower ends, and in close relationship to each other at their opposite ends, a pair of jaws hingedly mounted between said closely spaced arm ends, said jaws having a round groove formed therebetween for the reception of a guide rod, a clampin bolt for holding said jaws upon said guide rod and fixing its relation to said arms, a slide mounted on said rod, a scribing arm having, one endihinged to said slide and the other end provided'with a scribing point, the lower end of said guide rod having a shouldered point thereon adapted to 00- cupy'a hole formed in the center of the ellipse formed by said scribing point.

LEWIS D. STURM.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PAEEEN'I'S.v

Number Name Date 1,507,250 Overlin Sept; 2,1924 1,660,616 James Feb. 28,1928 1,991,117 Porteous et' a1 Feb. 12, 1935 FOREIGN'PATEN'IS Number Country Date 555,278 Great Britain Aug. 13, 1943 

